Patent EP0568477A2 successfully refreshed from Google Patents.
Patent US2624932A successfully refreshed from Google Patents.
US2624932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of firing silicon carbide ceramic products
Assignee: Saint Gobain Abrasives Inc
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Filing: 1950-07-24
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Granted: 1953-01-13
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Expires: 1970-07-24
Abstract
No abstract record available.
Inventors
- 👤 John K Sjogren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:30
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
PROCESS OF MAKING A SILICON CARBIDE CERAMIC PRODUCTS WHICH COMPRISES MIXING SILICON CARBIDE IN THE FORM OF GRAIN WITH POWDERED CERAMIC MATERIAL AND A TEMPORARY COMBUSTIBLE ORGANIC BINDER IN FLOWABLE FORM, CHARGING A MOLD WITH THE MIXTURE, EXERTING PRESSURE ON THE MIXTURE IN THE MOLD, REMOVING THE RESULTING GREEN PIECE FROM THE MOLD, THEN GRADUALLY RAISING THE GREEN PIECE TO A TEMPERATURE OF AT LEAST 1200* C. IN AN ATMOSPHERE WHICH UP TO THE TIME THE PIECE REACHES 400* C. IS AT LEAST 30% AIR AND BY THE TIME THE PIECE REACHES 1000* C. IS AT LEAST 30% STEAM.
Claim 2
Dependent Claim
99 words
PROCESS OF MAKING A SILICON CARBIDE CERAMIC PRODUCTS WHICH COMPRISES MIXING SILICON CARBIDE IN THE FORM OF GRAIN WITH POWDERED CERAMIC MATERIAL AND A TEMPORARY COMBUSTIBLE ORGANIC BINDER IN FLOWABLE FORM, CHARGING A MOLD WITH THE MIXTURE, EXERTING PRESSURE ON THE MIXTURE IN THE MOLD, REMOVING THE RESULTING GREEN PIECE FROM THE MOLD, THEN GRADUALLY RAISING THE GREEN PIECE TO A TEMPERATURE OF AT LEAST 1200* C. IN AN ATMOSPHERE WHICH UP TO THE TIME THE PIECE REACHES 400* C. IS AT LEAST 30% AIR AND BY THE TIME THE PIECE REACHES 1000* C. IS AT LEAST 30% STEAM.
References Cited (Backward Citations)
US2097620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |